CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 5,306,572	$ 7,342,152
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	3,278,628	4,558,260
Accretion expense	170,300	200,800
Gain on sale of property and equipment	(2,183)	(20,124)
Deferred income taxes	(17,000)	(18,000)
Changes in assets and liabilities:
Accounts receivable	468,362	(23,870)
Other current assets	93,718	(409,385)
Accounts payable	(541,985)	148,093
Accrued expenses	(404,998)	(452,413)
Total adjustments	3,044,842	3,983,361
Net cash provided by operating activities	8,351,414	11,325,513
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds received on receivables from employees	189,462	476,344
Advances disbursed to employees	(45,639)	(72,449)
Purchase of property and equipment	(1,163,015)	(2,680,733)
Proceeds on sale of property and equipment	13,000	924
Net cash used by investing activities	(1,006,192)	(2,275,914)
CASH FLOWS FROM FINANCING ACTIVITIES
Distributions	(5,685,965)	(5,688,949)
Proceeds from options exercised	20,122	20,470
Net cash used by financing activities	(5,665,843)	(5,668,479)
NET INCREASE IN CASH AND EQUIVALENTS	1,679,379	3,381,120
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD	19,661,106	16,610,772
CASH AND EQUIVALENTS AT END OF PERIOD	21,340,485	19,991,892
Supplemental disclosures of cash flow information and non-cash activities:
Cash paid during the period for: Income taxes	$ 77,625	$ 157,081